Michael Lewis, the popular explainer of all things pertaining to the stock market (“The Big Short”, “Liar’s Poker”) is back with “The Fifth Risk”, in which he ventures into the political marketplace. His piece is a commentary on what he considers a dangerous lack of expertise in the present administration.  Meanwhile, “Crashed” by Adam Tooze looks back on the changes brought about by the 2008 market downturn.  “Trump’s America” by Newt Gingrich celebrate’s “our nation’s great comeback”, while “Our Revolution, Bernie Sanders insists we have a long we to go.  And in  “21 lessons for the 21st century”,  Yuval Harari (“Sapiens”), looks ahead with  provocative questions about some of challenges that lie in wait for us.